This is the 664th most frequent Vietnamese word.
màu
"Color."
In this sentence, 'màu' is used to denote a type or the quality of color attributed to the noun 'chiếc áo' (the shirt).
Chiếc áo này có màu xanh.
This shirt has the color blue.
Here, 'màu' refers to the material or medium used for painting, specifying watercolors in this context.
Cô ấy thích vẽ bằng màu nước.
She likes to paint with watercolors.
In this usage, 'màu' is referenced to ask about the name or identity of a color.